(Table 153, contd)
Troubleshooting Test Steps
Values Results
E. Activate the fan override.
F. Monitor the active diagnostic code screen on the electronic serv-
ice tool. Check and record any active diagnostic codes. Wait at least
30 seconds in order for the diagnostic code to become active.
Disable the fan override. Remove the jumper wire.
If the fault is still present, contact the Dealer Solutions
Network (DSN).
i07381356
Cooling Fan Control - Test
(Viscous Clutch Fan)
This procedure is only applicable to engines with a
viscous clutch driven fan.
Use this procedure to troubleshoot the electrical
system if a problem is suspected with the engine fan
control solenoids. Use this procedure if one of the
diagnostic codes in Table 154 is active.
Table 154
Diagnostic Codes for Cooling Fan Control
J1939 Code
Code Description
(code descriptions may vary)
Comments
647–5
Engine Fan Clutch Output Device Driver : Current
Below Normal
The Electronic Control Module (ECM) detects an open circuit in the circuit
for the engine fan control solenoid.
The ECM sends minimum current to the fan control solenoid. The code is
logged.
647–6
Engine Fan Clutch Output Device Driver : Current
Above Normal
The ECM detects a short circuit to ground in the circuit for the engine fan
control solenoid.
The ECM sends minimum current to the fan control solenoid. The code is
logged.
The following background information is related to
this procedure:
Viscous Clutch Cooling Fan Solenoid
The viscous clutch cooling fan solenoid controls the
engagement of the clutch that drives the engine
cooling fan. The ECM determines the desired fan
speed based on the ATAAC temperature and the
coolant temperature. The viscous clutch cooling fan
solenoid is controlled by a PWM signal from the
ECM.
UENR4469-36 281
Circuit Tests
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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